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60a5317ff0
Impact: stack protector for x86_32 Implement stack protector for x86_32. GDT entry 28 is used for it. It's set to point to stack_canary-20 and have the length of 24 bytes. CONFIG_CC_STACKPROTECTOR turns off CONFIG_X86_32_LAZY_GS and sets %gs to the stack canary segment on entry. As %gs is otherwise unused by the kernel, the canary can be anywhere. It's defined as a percpu variable. x86_32 exception handlers take register frame on stack directly as struct pt_regs. With -fstack-protector turned on, gcc copies the whole structure after the stack canary and (of course) doesn't copy back on return thus losing all changed. For now, -fno-stack-protector is added to all files which contain those functions. We definitely need something better. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> |
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cpufreq | ||
mcheck | ||
mtrr | ||
.gitignore | ||
addon_cpuid_features.c | ||
amd.c | ||
bugs.c | ||
bugs_64.c | ||
centaur.c | ||
centaur_64.c | ||
cmpxchg.c | ||
common.c | ||
cpu.h | ||
cyrix.c | ||
hypervisor.c | ||
intel.c | ||
intel_cacheinfo.c | ||
Makefile | ||
mkcapflags.pl | ||
perfctr-watchdog.c | ||
powerflags.c | ||
proc.c | ||
transmeta.c | ||
umc.c | ||
vmware.c |